P2BFEExhaust Flow Control Valve B Position Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The position feedback of exhaust flap B reads below its lowest valid value. For an analog sensor that means a signal at or near 0 V, typically a short to ground or a missing 5 V supply; for a PWM feedback it means a duty cycle stuck near zero. No manufacturer publishes P2BFE. The nearest documented cases concern valve A: Mazda stores P2BF6 for a low shutter valve position signal and Deutz for a flap voltage below normal. GM watches the second valve of its 23OBDG07 application under its own code, failing below 2 percent duty cycle for 4 seconds. CARB requires such out-of-range checks. Because the two flap sensors often share a supply, a low reading on both sides at once suggests the common reference circuit rather than sensor B; a low on B alone points to its own wiring.
- What you may notice
- Check engine light on
- Flap B no longer adjusted, exhaust sound unchanged
- Likely causes
- LikelyFlap B signal wire shorted to ground
- PossibleSensor reference supply open or shorted
- RarePosition sensor in actuator B failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.